"No-Dish" option for 6spd to single conversion?

Singlespeed & Fixed Gear"I still feel that variable gears are only for people over forty-five.
Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

Hey all. This is my first post and it has to do with converting old 5, 6 and 7 speed freewheels to single speed. I just bought an early 80's Schwinn Traveler 12spd and did the cursory SS conversion by swapping the crank and just reusing the 6spd freewheel.

Does anybody know of a thread-on spacer type of product out there that will allow for a BMX style freewheel installation without having to redish the rear wheel for proper chainline? In most cases, simply throwing a BMX single freewheel onto the hub's threads just throws the chainline way off.

It would be a great product if someone could make a conversion kit for older freewheel hubs, not just cassettes. Does it exist? Any home-built remedies?

Thanks for the response. I was actually interested in finding if such a conversion kit exists for business reasons. I plan on buying/converting/reselling vintage road or touring bikes locally in my town. Such a quick and easy solution would save me time and money (hopefully). If I were keeping the Traveler, I would attempt the re-space/re-dish. Otherwise, for business purposes, it would be too time consuming.

For now, I will just sell the bikes with reused multi-gear freewheels and let the new owners do upgrades.

I suggest making sure that the chain line and chain tension is perfect with that set-up. It's quite easy for the chain to want to jump cogs if either of these isn't perfect when using the whole freewheel on a single speed. The result - jammed drive-train (unhappy customer, safety issues) or slipping pedals and dropped chain (unhappy customer, safety issues).

Another option is to put new rear wheels on the bikes. Singlespeed complete wheels can be had pretty cheaply, possibly even cheaper than your time to re-space and re-dish.

Not trying to be difficult, but I don't think you're providing much value if you don't put a proper cog on and re-space and re-dish the wheel. But if the market is there then by all means...go ahead. Some groups are desperate for single speeds and not too concerned about how they actually function, so you may have the demand you need.